/**
 *  Copyright (c) 2025 taskylizard. Apache License 2.0.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
export function groupBy<T, K extends keyof any>(
  arr: T[],
  key: (i: T) => K
): Record<K, T[]> {
  return arr.reduce(
    (groups, item) => {
      // biome-ignore lint/suspicious/noAssignInExpressions: <explanation>
      ;(groups[key(item)] ||= []).push(item)
      return groups
    },
    {} as Record<K, T[]>
  )
}
